Process for manufacturing a tubular body made of synthetic material, and installation for carrying out this process



y 5, 1965 v. DJEVAHIRDJIAN 3,185,551

PROCESS FOR MANUFACTURING A TUBULAR BODY MADE OF SYNTHETIC MATERIAL, -.AND INSTALLATION FOR CARRYING OUT THIS PROCESS Filed June 1, 1960 INVE'NTOR Velma DJEVAIIIRDJMN ymfmww United States Patent PROCESS FOR MANUFACTURING A TUBULAR EGDY MADE OF SYNTHETIC MATERIAL, AND INSTALLATION FOR PRQCESS Vahan Dievahirdjian, Monthey, Switzerland, assignor to Industrie de Pierres Scientifiques Hrand Djevahirdjian S.A., Monthey, Switzerland, a firm of Switzerland Filed June 1, 1960, Ser. No. 33,299

Claims priority, application Switzerland, June 5, 1959,

6 Claims. (Cl. 23-273 The present invention relates to a process for manufacturing a tubular body made of synthetic material, by melting a powdery material and accumulating this material on a rotatable support.

The invention relates also to an installation for carrying out this process, comprising a stove inner which is arranged a rotatable support on which the melting material intended to constitute the said tubular body of synthetic stone is accumulated.

The process is characterised by the feature that one projects powdery material on a support, while this material is incorporated to the flame of a blow-pipe substan tially parallel to the axis of rotation of the support, but excentric with respect thereto, and that one uses a second blow-pipe, the axis of which is oblique with respect to the axis of the first one, and the flame of which is directed onto the surface where the melted material forms a deposit, at

the same place where the first blow-pipe is operating, in.

two blow-pipes are arranged in the stove, one of which,

which is a dispenser of powdery material, has its axis sub stantially parallel to the axis of rotation of the support, but which is excentric with respect thereto, and the second of which, which is oblique with respect to the first one, acts on the surface on which the melted material forms a deposit, at the same place where acts the first blowpipe, so as to prevent the melted material from moving toward the axis of rotation of the support.

The drawing shows, by way of example, one embodiment of the object of the invention.

FIG. 1 is an elevational view, with partial section, of an installation for manufacturing a tubular body made of synthetic stone.

PEG. 2 is a view of a detail of FIG. 1, with partial section, at an enlarged scale. i

FIG. 3 is a sectional view of a detail of FIG. 1, alon line III-J11 of FIG. 1. h FIG. 4 is a sectional view along line 1VIV of FIG. 1, and, a j h FIG. 5 is a view of a detail at an enlarged scale, showing the position of the tube in formation with respect to the blow-pipes.

The installation represented comprises aframe 1 carrying a pillar 20h which is secured a collar 3. A table 4 bears, by means of a sleeve 4a, on the collar 3. This table is thus held in height, while being ableto rotate CARRYING OUT THIS on the pillar 2. The table4 carries a stove 5 made of fire-proof'material, on which is located a cover 6, likely made of fire-proof material. a p p The pillar 2 carries moreover, secured to a. support 7, two blow-pipes, one of which, designated generally by 8,

is shown in FIG. 1, and the other ofwhich has only its ending pipe 9 shown in FlG. 3; this secondblow-pipe is.

located behind. the blow-pipe 8 when the installation is. seen as in FIG. 1. The blow-piped, of the so-called Verneuil type, comprises a container 10, containing alu- "ice mina powder. The bottom 11 of this container is consituted by a siever and its cover 12 is stroken by a hammer 13, at a rate of several strikes per second. At each strike, a certain quantity of the powder contained in the container 10 falls into a tundish 14- located under this container. This tundish is prolongated upwards by an envelope 14a surrounding the container 10, in which opens apipe 15 for the induction of oxygen; downwards, this tundish 14 is prolongated by a pipe 141) surrounded by a pipe 16 in which opens a pipe 17 for the induction of hydrogen. The blow-pipe 8 thus produces a hydrogenoxygen flame in which is incorporated alumina powder. The second blow-pipe is of the same type, with the difference that it does not comprise dispensing means for powder.

The pillar 2 carries a bracket 18, supported by a rod 19, and on which lies a table 20 carrying on the one hand a rotative shaft 21, parallel to the pillar 2, and on the other hand a motor 22 driving this shaft by means of a belt 23. The table 2% carries moreover a rod 24 extending freely through a hole 25 of the table 4. The table 20 thus can move axially along the pillar 2, independently from the table 4, but is dependent therefrom angularly.

A shaft 26, at one extremity of which is secured a gear 27, is rotatably mounted on the bracket 18. This shaft 26 carries, at its other hand, a control wheel 28. The gear 27 meshes with the teeth of a toothed sector 20a (PEG. 4) of the table 20. Thus, when operating the wheel 28, the table 20 is rotated and consequently the table 4 too, around the pillar 2; This displacement allows to set off, on an adjustable value, the axis of the shaft 21 and of the blow-pipe 8 one with respect to another.

The tubular body it is desired to be formed, designated by 30 in FIG. 5, is obtained by projecting alumina powder on a support -31 (FIG. 3), made of fireproof material or of corundum, mounted at the extremity of the shaft 21. Owing to the fact that the blow-pipe 8 is slightly eccentric with respect to the axis of the shaft 21, the body 7 3% obtained is hollow. The second blow-pipe blows the melted alumina so as to prevent it from moving towards the centre.

The support 31 will have the shape of a small ball of a diameter corresponding to the diameter of the tube it is desired to be obtained; for tubes of a relatively large diameter, the support can have the shape of a sheave or of a ring. The support is constituted by a germ or a seed, it is to say by a crystal having the same orientation as the crystal it is desired to be obtained. The experience has shown that theoptical axis of the seed ought to form, preferably, an angle of 20 to 30 wih the growth axis. When modifying this angle, it is possible to form bodies of several outer shapes. Thus, with an angle of for instance, it is possible to obtain a tube of rectangular outer section.

Since the surface on which the melted alumina forms a deposit has to be continuously located in the warmest place of the flame, the bracket 18, with the table 26, moves downward alongthe pillar 2,, as the body 39 increases -in size. This movement is obtained owing to a motor 32 carried by the'frame 1 of the apparatus and driving, through a belt 33, agear 34 meshing with a toothed rack 35 provided on the rod19.

; As a modification, the installation can be provided with means allowing to impell to the support 31, in additionanufacturing a: tubular body the said material on a rotatable support extending into an inner chamber of a stove which includes a first blow-pipe, the improvement comprising a second blow-pipe opening into the interior chamber of said stove, means cooperating with the first of said blow-pipes for dispensing the synthetic powdery material upon the rotatable support, said first blow-pipe having an axis substantially parallel to the axis of rotation of the rotatable support but eccentric with respect thereto, and second of said two blow-pipes having an axis which is oblique with respect to the axis of the first blow-pipe and is directed toward the rotatable support surface where the melted material forms a deposit on said support at the same place where the first blowpipe is acting whereby the deposited melted material is blown radially outwardly with respect to the axis of rotation of the rotatable support to prevent the said melted material from moving toward the said axis of the rotatable support.

2. In an installation for manufacturing a tubular body by melting a synthetic powdery material and accumulating the said material on a rotatable support extending into an inner chamber of a stove which includes a first blow-pipe, the improvement comprising a second blow-pipe opening into the inner chamber of said stove and arranged in a plane radial with respect to the axis of rotation of the rotatable support, means cooperating with the first of said two blow-pipes for dispensing synthetic powdery material upon the rotatable support, said first blow-pipe having an axis substantially parallel to the axis of rotation of said rotatable support but eccentric with respect thereto, and the second of said two blow-pipes having an axis which is oblique with respect to the axis of the first blow-pipe and is directed toward the rotatable support surface where the melted material forms a deposit at the same place where the first blow-pipe is acting thereby blowing the deposited melted material radially outwardly with respect to the axis of rotation of the rotatable support to prevent the said melted material from moving towards the said axis of the rotatable support.

3. In an installation for manufacturing a tubular body by melting a synthetic powdery material and accumulating the said material on a rotatable support extending into an inner chamber of a stove which includes a first blow-pipe, the improvement comprising a table carrying said rotatable support, said table being movable in a direction parallel to the axis of rotation of said rotatable support, a second blow-pipe opening into the inner chamber of said stove, means cooperating with the first of said two blow-pipes for dispensing synthetic powdery material upon the rotatable support, said first blow-pipe having an axis substantially parallel to the axis of rotation of the rotatable support but eccentric with respect thereto, and the second of said two blow-pipes having an axis which is oblique with respect to the axis of the first blow-pipe and is directed toward the rotatable support surface where the melted material forms a deposit at the same place where the first blow-pipe is acting whereby the deposited melted material is blown radially outwardly with respect to the axis of rotation of the rotatable support to prevent the melted material from moving toward the axis of the rotatable support.

4. In an installation for manufacturing a tubular body by melting a synthetic powdery material and accumulating the said material on a rotatable support extending into an inner chamber of a stove which includes a first blowpipe, the improvement comprising a second blow-pipe opening into the inner chamber of said stove, means cooperating with the first of said blow-pipes for dispensing powdery synthetic material upon the rotatable support, said first blow-pipe having an axis substantially parallel to the axis of rotation of the rotatable support but eccentric with respect thereto, and the second of said two blow-pipes having an axis whichis oblique with respect to the axis of the first blow-pipe and is directed toward the rotatable support surface where the melted synthetic materials form a deposit at the same place where the first blow-pipe is acting thereby blowing the deposited melted synthetic material radially outwardly with respect to the axis of rotation of the rotatable support, and a movable table carrying said rotatable support, said table being movable in a first direction parallel to the axis of rotation of the support and in a second direction perpendicular to said last-mentioned axis for permitting the rotatable support carried by said table to be displaced perpendicularly to its axis and the axis of the first blow-pipe whereby the eccentricity of the said first blow-pipe is relatively adjustable.

5. In an installation for manufacturing a tubular body by melting a synthetic powdery material and accumulating the said material on a rotatable support extending into an inner chamber of a stove which includes a first blow-pipe, the improvement comprising a stationary frame, a table carrying said rotatable support, said table being rotatably mounted on said stationary frame for rotational movement about an axis parallel to the axis of rotation of said rotatable support, means for rotating said rotatable table with respect to said stationary frame, said means including a gear rotatably carried by said stationary frame in mesh with a toothed sector coupled to the rotatable table, said toothed sector being arranged coaxially with respect to the axis of rotation of said rotatable table whereby rotation of said gear produce rotation of said rotatable table with respect to said stationary frame, a second blow-pipe opening into the inner chamber of said stove, means cooperating with the first of said two blowpipes for dispensing synthetic powdery material upon the rotatable support, said first blow-pipe having an axis substantially parallel to the axis of rotation of the rotatable support but eccentric with respect thereto, and the second of said two blow-pipes having an axis which is oblique with respect to the axis of the said first blow-pipe and is directed toward the rotatable support surface where the melted synthetic material forms a deposit at the same place where the first blow-pipe is acting thereby blowing the deposited melted synthetic material radially outwardly with respect to the axis of rotation of the rotatable support so as to prevent the melted synthetic material from moving toward the axis of the rotatable support.

6. In an installation for manufacturing a tubular body by melting a synthetic powdery material and accumulating the powdery material on a rotatable support extending into an inner chamber of a stove which includes a first blow-pipe, the improvement comprising a stationary frame, a first table rotatably mounted on said stationary frame for rotation about an axis parallel to the axis of rotation of said rotatable support said first table carrying said rotatable support, means for rotating said first table with respect to said stationary frame, said means including a gear rotatably mounted on said first table, a toothed sector in mesh with said gear and coupled to a second table about an axis of rotation parallel to the axis of rotation of said rotatable support, said toothed sector being coaxial with the axis of rotation of said first table whereby rotation of said gear produces rotation of said first table with respect to said stationary frame, said second table carrying said stove, said first and second tables being coaxial with said means causes rotation of both the first and second tables, a second blow-pipe opening into the inner chamber of said stove, means cooperating with the first of said blow-pipes for dispensing synthetic powdery material upon the rotatable support surface, said first blowpipe having an axis substantially parallel to the axis of rotation of said rotatable support but eccentric with respect thereto, and the second of said two blow-pipes having an axis which is oblique with respect to the axis of the said first blow-pipe and is directed toward the surface where the deposited melted material forms a deposit at the same place where the first blow-pipe is acting thereby blowing the melted material radially outwardly with respect to the axis of rotation of the rotatable support so as 5 6 to prevent the melted material from moving o tward the 2,697,308 12/54 Dauncey 23301 axis of the rotatable support. 2,816,848 12/57 Maxon. 2,851,264 9/58 Bryant. References Cited y the Examiner 2,852,890 9/58 Drost et a1. 23 273 UNITED STATES PATENTS 5 FOREIGN PATENTS Harris. 4 5 G tB 1,597,293 8/26 Ruff. 77 0 m tea n 2,190,350 2 40 Howard 2 23 6 NORMAN YUDKOFF, 'y Examiner- 2,471,437 5/49 Lester et a1 10 MAURICE A. BRINDISI, ANTHONY SCIAMANNA,

2,529,971 11/50 Schmidinger 23-273 Examiners. 

1. IN AN INSTALLATION FOR MANUFACTURING A TUBULAR BODY BY MELTING A SYNTHETIC POWDERY MATERIAL AND ACCUMULATING THE SAID MATERIAL ON A ROTATABLE SUPPORT EXTENDING INTO AN INNER CHAMBER OF A STOVE WHICH INCLUDES A FIRST BLOW-PIPE, THE IMPROVEMENT COMPRISING A SECOND BLOW-PIPE OPENING INTO THE INTERIOR CHAMBER OF SAID STOVE, MEANS COOPERATING WITH THE FIRST OF SAID BLOW-PIPES FOR DISPENSING THE SYNTHETIC POWDERY MATERIAL UPON THE ROTATABLE SUPPORT, SAID FIRST BLOW-PIPE HAVING AN AXIS SUBSTANTIALLY PARRALLEL TO THE AXIS OF ROTATION OF THE ROTATABLE SUPPORT BUT ECCENTRIC WITH RESPECT THERETO, AND SECOND OF SAID TWO BLOW-PIPES HAVING AN AXIS WHICH IS OBLIQUE WITH RESPECT TO THE AXIS OF THE FIRST BLOW-PIPE AND IS DIRECTED TOWARD THE ROTATABLE SUPPORT SURFACE WHERE THE MELTED MATERIAL FORMS A DEPOSIT ON SAID SUPPORT AT THE SAME PLACE WHERE THE FIRST BLOWPIPE IS ACTING WHEREBY THE DEPOSITED MELTED MATERIAL IS BLOWN RADIALLY OUTWARDLY WITH RESPECT TO THE AXIS OF ROTATION OF THE ROTATABLE SUPPORT TO PREVENT THE SAID MELTED MATERIAL FROM MOVING TOWARD THE SAID AXIS OF THE ROTATABLE SUPPORT. 